"subterranean sepulchre in ancient Roman places with niches for urns holding remains," neuter of Latin columbarius, "dove-cote" (so called from resemblance), literally "pertai [..]

means an arrangement of niches that may include an entire building, a room, a series of special indoor alcoves, a bank along a corridor or part of an outdoor garden setting.

A structure of vaults lined with recesses for urns containing cremated remains. COMMITTAL SERVICE

A columbarium is a public storage place of cremated remains of deceased. The remains are generally kept in cinerary urns. Columbarium walls are a common feature of many cemeteries, reflecting the incr [..]

(n) a birdhouse for pigeons(n) a niche for a funeral urn containing the ashes of the cremated dead(n) a sepulchral vault or other structure having recesses in the walls to receive cinerary urns

An indoor or outdoor wall for the Inurnment

, etc.   Memorial Marker

A structure that is used to house the cremated remains (ashes) of the deceased person. It may be either freestanding, or part of a chapel or mausoleum.

"Columbarium" means a structure or room containing receptacles for permanent inurnment of cremated remains in a place used, or intended to be used, and dedicated for cemetery purposes.